Improvement in safety-valves for steam-boilers



J. R.. CAZIER.y

lmprvement in Safety-Valves for Steam-Boiiers.

Patented July 9,1872.

No.v 128,851.

Witnesses THE Dams Evans co.. PNo'ro-Lrmc. WASHINGTON, u. c4

PATENT OFFICE.

JOHN n. cAzIEn, on NORTH EAST, rENNsYLvANrA.

IMPROVEMENT IN SAFETVVALVESFOR "STEAM-BOILERS.

Specification forming part of Letters Patent No. 128,851, dated J nly 9, 1872.

To all whom it may concern:

Beit known that I, VJOHN R. CAZIER, ,of North East, in the county of Erie and' State of Pennsylvania, have invented certain new and useful Improvements in Safety-Valves for Steam-Boilers and do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawing and to the letters of reference marked thereon. Y

My invention relates to the addition to steam safety-valves of an appendage by which, after the valve'opens,the issuing steam shall have more power to lift the opposing weight or spring', and thus to escape more freely.

' In order to enable others skilled in the art to which my invention appertains to make a'nd use the same', I will now proceed to describe its construction and operation, referring to the annexed drawing, which forms a part of this specification, and in which- Figure 1 is a transverse vertical section of la machine embodying my invention, the valve opening downward. Fig. 2 represents the principal parts detached or separated. Fig. 3

is a view similar to that shown in Fig. 1, ex.

cept in thelhingingof the valve-lever, and in the formation of the removable piece containing the valve-seat so that the valve s all open upward instead 012:' downward.v 4

B represents the dome of a steam-boiler, and C the pipe turningdownward, so that water condensing from steam generated in the boiler cumference,'is cylindrically formed, to matchthe short tube E, but seas to work easily up,

and down in it. The tube E ordinarily over` laps the valve-seat tube F. The extent to which it overlaps is regulated by the adjusting-screws 'Gf G in the yoke H, which is at tached crosswise to the tube E at its lower end. A spring, I, which is banded to the graduating `be attached to the yoke, as shown in Fig. 2,

to engage the edge of the spring on either side. A cord, L, passing over pulleys b b, one at each end of the. lever J, connects with the spring, which by it can be forced toward the lever, carrying the tube E with it. The valve pin k hinges upon the valve-lever J, which has a poise at M and a fulcrum attached to the tube C. When the valve begins to part from its seat by the steam pressure against it, the. issuing steam being much confined by the tube E, and now having a much larger surface ofthe valve to act upon, readily forces it from its seat till the tube E ceases to overlap the -tube F, when the steam escapes with a tube as described, may be made of other' thanl circular form on their outer surfaces if desired. Instead of the spring I, a spiral spring, surrounding the valve-pin, may be'ernployed, as seen at o', Fig. 2, the quadruple hook 4above the spring beingdesigned to attach crosswise and permanently to the yoke H, when the spring can be connected by screwing it upon the lower extremities of the hook.

The valve-seat tube F must be of proper size in its inner diameter to screw to the tube G, and in its outer diameter to nearly llthe tube E when the latter passesover'it'. This last object can be accomplished bymeans of a shoulder, as at f, Fig. 2, .to avoid excessive weight. The valve-tube F attaches by screwoperated by means of a spring, substantially las and for the purposes herein set forth.

In testimony that I claim the foregoing, I have hereunto set my hand and seal this 1st day of April, 1872.

Witnesses: JOHN It. CAZIER.

JOHN N. VALLEY, GAROLXNE A. VALLEY. 

